Wrote a script that gave us the flag.

```
import hashlib

# Given encoded list
enc = [ ] # the txt list

# Step 1: Convert each integer back to its hexadecimal string representation
hex_strings = [hex(val)[2:] for val in enc]

# Step 2: Determine the original ASCII values from their MD5 hashes
decoded_characters = []
for hex_string in hex_strings:
found = False
for ascii_value in range(256): # Possible ASCII values range from 0 to 255
md5_hash = hashlib.md5(str(ascii_value).encode()).hexdigest()
if md5_hash == hex_string:
decoded_characters.append(chr(ascii_value))
found = True
break
if not found:
print(f"No match found for hash: {hex_string}")

# Join the decoded characters to form the original string
original_string = ''.join(decoded_characters)

print("Original string:", original_string)
```

Flag: `FLAG{13epl4cem3nt}`